This paper presents a successful application of fuzzy logic in the design of an interactive control system for an architectural living space. Fuzzy logic is applied in order to process subjective perceptual data based upon aesthetic considerations. In the interactively modifiable living space, occupants can generate various sensory-perceptive spatial qualities with affective dimensions in real time. This is accomplished by modifying one or more design parameters of color, brightness, texture, and material in order to meet the emotional, psychological, proprioceptive and aesthetic needs associated with daily living. The human-space interaction is perception-based. It is structured around a set of aesthetic guidelines formulated from correlations that measure the extent to which each design parameter impacts user perception. Fuzzy logic system implements the aesthetic guidelines as fuzzy control rules in the analysis. It allows for processing non-numerical, linguistic data in order to modify appropriate design parameters and produce spatial outputs that are meaningful and effective for the occupants.